Speedup function profile by using a hash table instead of a linear scan

runtime/vm/object.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 5156 matching lines @@
 void PatchClass::set_origin_class(const Class& value) const {
   StorePointer(&raw_ptr()->origin_class_, value.raw());
 }
 
 
 void PatchClass::set_script(const Script& value) const {
   StorePointer(&raw_ptr()->script_, value.raw());
 }
 
 
+intptr_t Function::Hash() const {
+  return String::HashRawSymbol(name());
+}
+
+
 bool Function::HasBreakpoint() const {
   if (!FLAG_support_debugger) {
     return false;
   }
   Thread* thread = Thread::Current();
   return thread->isolate()->debugger()->HasBreakpoint(*this, thread->zone());
 }
 
 
 void Function::InstallOptimizedCode(const Code& code, bool is_osr) const {
@@ skipping 16549 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart